Improvement in machinery for rifling guns



UNirn TATES Fries.

PATENT W. H. GVYNNE, OF BROOKLYN, NEW YORK, ASSIGNOR TO HIMSELF, O. A.RUNNER, AND H. G. NORTON, OF SAME PLACE.

IMPROVEMENT N MACHINERY FOR RIFLING GUNS.

Specification forming part of Letters Patent No. 33,884, dated December10, 1861.

.To all whom t may concern.-

Be it known that I, W. H. GWYNNE, of the city of Brooklyn, county ofKings, State of New York, have invented a new and useful Machine forRifling Guns; and I do hereby .declare that the following is a full,clear, and

' gun to be rifled, and Fig. 2 shows a transverse section of the same.Fig. 8 is a transverse section showing plainly the spiral slots orgrooves K K in the shaft F. Fig. et shows a front view of the guide H,which is fastened to the gun I by the set-screws G G.

To enable others skilled in the art to make and use my invention, I willproceed to give a descript-ion of its construction and operation.

The machine consists of a hydraulic pump A, of any suitable pattern, apipe B, piston C, cutters D D D, expanding-rod E, hollow riding-shaft F,and guide H, with its set-screws G G.

The pump A is a small hydraulic pump, to be driven by hand-power or anyother suitable motor. The pipe B is connected to the gun by screws orother suitable device. Pist0n C is made of iron and covered with anoutside covering of leather or any suitable .material to render itwater-tight, and is fastened firmly to the shaft F. The cutters D D Dare made of steel or any suitable matcrial and are fitted into recessesof proper size in hollow shaft F. It is obvious that the cutters can bemade of any desired shape or size. The expanding-rod E is made of iron,steel, or other suit-able material, and it has one end made conical, andthe other end has on it a male thread fitting into a correspondingfemale thread or screw in the end of hollow shaft F. The ends of cuttersD D D rest against rod E, which, turned to the right, causes the conicalend to drive out the cutters D D against the inside of the gun to anydesired distance. The same rod E being turned to the left, the cutters DD will return in their chambers flush with the surface of the shaft F.The hollow riding-shaft is made of iron, steel, or other suitablematerial, and has the outer end of the bore slightly contracted, onwhich there is a female thread or screw cut to receive the male threadof rod E. On the outside of shaft F are cut spiral grooves or slots K K,made with whatever degree of twist it is necessary to have therifle-grooves of the gun, so that when moved back or forth the rod takesa rotary motion from the feathers or pins I I in the guide II H; rlheguide H H is made of iron or other suitable material, with iron or othermetal set-screws G G, by which it can be fastened to the gun to beritled. It is bored to correspond with shaft F, and is also providedwith pins or feathers fitting into slots K K in shaft F, the Wholeoperating substantially as shown and described.

To operate my machine, the pump A is connected to the gun to be rifledby the pipe B, and the shaft F with its piston O. The cutters D D andexpanding-rod E are then placed in the gun. The guide H, with its pins II, is then slipped over shaft F and firmly fastened to the gun byset-screws G G. The rod E must be turned to the right hand as much as itis required to set out the cutters D D. The pump'A must then be startedand water forced into the gun behind the piston C. The entering waterwill drive the riflingshaft F forward with its cutters and attachments,thereby cutting grooves in the gun to whatever depth the cutters D D maybe set by rod E. lf the grooves in the gun are not perfect at one cut,the riding-shaft F can be forced back into the gun by slacking thecutters D D D. By turning expanding-rod E to the left handa-fresh supplyof water can then be forced into the gun and the shaft and cuttersdriven forward through the gun, which operation may be repeated untilthe grooves are perfect, thus .forming the riflegrooves in guns in acheap, simple, and perfect manner without moving the gun from its placein field or fortification, thus avoiding all expense of transportationof guns to distant machine-shops, which has been the custom and practiceheretofore.

NOW, having thus fully described my invention, what I claim as new, anddesire 13o and shown. secure by Letters Patent, is

l. The direct application of hydraulic i H GVVYNNE pressure for thepurpose of filling guns. Nitnessesz 2. The combination of the hollowshaft F, W. W. CULVER,

expanding-rod E, cutters D D, and piston C,

JAMEs N. CULVER.

the Whole operating substantially as described

